Markus Armbruster, le mer. 10 mars 2021 14:17:48 +0100, a ecrit: > Thomas Huth <th...@redhat.com> writes: > > When trying to remove the -usbdevice option, there were complaints that > > "-usbdevice braille" is still a very useful shortcut for some people. > > Pointer? I missed it.
For instance https://lists.nongnu.org/archive/html/qemu-devel/2018-01/msg00693.html > "braille" is the only driver with a factory. "-usbdevice braille" is > sugar for > > -device usb-braille,chardev=braille -chardev braille,id=braille > -machine usb=on > > It's buggy: > > $ qemu-system-x86_64 -S -usbdevice braille > qemu-system-x86_64: -usbdevice braille: '-usbdevice' is deprecated, > please use '-device usb-...' instead > [three seconds tick by...] > Segmentation fault (core dumped) I don't have time to keep testing the usbdevice braille option of qemu from git indeed. But I do use the option at least weekly/monthly with releases. And some braille users do depend on it for their daily work. > It neglects to actually parse PARAMS: > > $ qemu-system-x86_64 -S -usbdevice braille:"I'm a Little Teapot" > qemu-system-x86_64: -usbdevice braille:I'm a Little Teapot: '-usbdevice' > is deprecated, please use '-device usb-...' instead I wasn't aware of the issue, thus not fixed of course. > The only one that has something approaching a leg to stand on is > braille. Still, I fail to see why having to specify a backend is fine > for any number of other devices, but not for braille. Because people who use this option have no idea how they would be supposed to make it work otherwise. > -device usb-braille,chardev=braille -chardev braille,id=braille > -machine usb=on This is *way* beyond what people would work out, even if documented. For them a braille device is just one device, there is no need for notion of frontend/backend, this is all in just one "device" for them. Put another way, it does not even make sense to build anything different from what you wrote: using another chardev backend with usb-braille frontend doesn't make sense, and exposing the braille chardev backend on another usb frontend doesn't make sense either. > If users need more time, we can extend the grace period. They don't need time, they need things that are simple to use. That three-option black magic really isn't. Samuel
